
Mark M. answered 12/07/16
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Mathematics Teacher - NCLB Highly Qualified
A light year (the distance light travels in one year) is 5.87849981 x 1012 miles.
The width of the Milky Way Galaxy (ours) is 1 x 106 light years.
That is 5.87849981 x 1018 miles.
Or
58,784,998,100,000,000 miles.
Approximately 20,000,000 other galaxies populate the known Universe.
Still think it is not true?